NITROGEN-CONTAINING TETRACYCLIC COMPOUNDS HAVING ANTI-ALLERGIC AND ANTI-ASTHMATIC ACTIVITIES, THEIR PREPARATION AND USE

摘要

Compounds of formula (I): (I) ¢wherein: A-B is =C=CH- or a nitrogen atom; R1 is hydrogen, alkyl, aryl or aralkyl; and Z is alkylene! and pharmaceutically acceptable salts thereof are useful in the treatment and prevention of allergies and asthma.